He currently plays for Cobh Ramblers, wearing the number 7 shirt. He plays primarily as a Forward. His preferred foot is Right.

His most recent move was a from Cobh Ramblers to College Corinthians AFC on 2026-01-01.

In the Ireland First Division 2025 season, oscar ahern scored 0 goals and provided 0 assists across 6 appearances, averaging 0 goals per game with 0 shots attempted and 0 on target.